In 1982, an intact group of 37 preschoolers (age 4) attending a play-oriented preschool were tested using the Lunzer Five Point Play Scale (1955) to obtain a block performance measure. To statistically control for social economic status (SES), IQ and gender, the McCarty Scales of Children's Abilities (1972) were given, the gender determined, and an SES score obtained (Hollingshead & Redlick, 1958). In 1998, after these same participants had completed high school, their records were obtained. Outcome measures for the 3rd, 5th, and 7th grades included standardized tests and report card grades in mathematics. High school achievement was determined by using 1) number of courses, 2) number of honors courses, 3) advanced math courses taken, and 4) grades. While controlling for IQ and gender, the block performance measure was correlated and regressed against these outcome variables. No significance was found at the 3rd- and 5th-grade levels by evaluating report card grades and standardized math scores. At 7th-grade, there was a significant correlation between blocks and standardized math scores, but not report card grades. At the high school level, there was a positive correlation with all high school outcome variables. There was no correlation between block performance and standardized math tests or grades at the elementary school levels. However, at the beginning of middle school, 7th grade, and in the high school grades, a positive correlation between preschool block performance and math achievement was demonstrated.